Self-locking pin or bolt



Feb. 21, 192-8.

. 1,659,992 5. A. CRONE SELF LOCKING PIN 0R BOLT Filed Sept. 1 925 2 Sheds-Sheet l INVENTOR ,52-7'4 r9. d'xm/vf ATTORNEY Feb.2 1, 1928. 1,659,992

s. A. CRONE SELF LOCKING PIN 0R BOLT Filed Sept. 1925 2 Sheets-Sheet 2 INVENTOR ,6'577/ 4. wan 5 ATTORNEY Patented Feb. 21, 1928.

UMTE STATES P T NT Q E- caonn, or Brier cleanse, new JERSEY, ASSEG-NOR- 'ro UFFALO-BRAKE BEAMeoMPANY, A CORPORATION. or NEW YORK.

sELro'cxme'm'n on now.

This invention 'relates to improvements in self-looking pins or bolts for railway *brake beam levers and their connections, 'and' like 7 devices.

One of the objects of this invention is to produce a pin or bolt which will have greatly increased rigidity at the forward or insertion end, over other self-locking pins.

Anotherobject of this invention'is'toproaway, of a truss brake beam including 'self- 1 looking pins embodying my invention;

duce a self locking .pin'whi'c'h will have increased weather-resisting proper ies "and durability. I y

-Another obj ect of the invention "is "to pro- "vide a"do'uble mounting for the self-locking jpawl, "to the end that the pawl will-be retained in operative position independently 'ofits' "pivot pin, whereby even though the Eivotlpin fails to ol the pawl willstill be eldin operative position.-

Another objectof the inventionis t'o pro- 'fvideforthep'awl a'firm limiting-stop against outward movement. I

Another ob'ectof the invention is "toutilizein a self-locking pin construction 'ofthe eharjacter'specified, a pawl having a projecting 7 portion rounded 'at the opposite corners of its 'rear' end to enable a more ready retraction'of the bolt through a series of-holes of varying-diameters in railway brake beamf 3Q leversan'dtheir connections.

Another object is to provide a 'pm construotion in which an'axial bore having an isolated'opening of less lengthfthan the boreextendingfrom 's'a'i-d bore through the wall of the pin'provides a pawlhousing-and maintains a continuous peripheral wall at'theend ofth'epin thereby greatly strengthening the construction and also enabling'the'enclosure of'all m'o'unting and actuating parts of the 49 pawl, excepting the operating 'nosef thereof. v Another object is to'utilize at the forward or insertione'ndof the pin, a cap for the axial bore having mounting members adapted to fit within the bore and add'further to the solidity andrigidity of 'the'construction 'at'thesa'me time tocompletely close'the said insertion orfforward"endoftsaid pin so .118 "to Ina-kefthe pawl parts and springs weather proofl to fpreve'nt deterioration"there I of due towea' ther-and other causes, and to I protect the same fromthe entrance ofdust and dirt.

With "these and" other objects in view; the

etmprisesthe combination of mem bers and arrangement of parts socombined as'to co-ac-t and cooperate with each other in the performance of the functions and the accomplishment-of the results herein contemplated, and comprises in one of its adaptations the species or preferred form illustrated in the accompanying drawings, in

Fig. 1 is a perspective view, partly broken Fig.2 is'a section on the line :22-of Fig.

1,'looking inthe direction 'of'the'arrow;

Fig. 3' is a section' 'on-the line'3-3of Fig. 1, looking-in the direction of'the arr0w;

Fig. 4 1s a cross-sectiononthe line I of Fig. 3, looking in the direction of the I arrow;

3 showing a pin or bolt partially withdrawn or retracted from registering bearing apertures in the lever and mounting members of 'a tr'uss brake beam;

"Fig. 7 is an elevation of a pin embodying my lnventlon and,

"Fig.8 is an elevation of a cap and'mountj ing connection for the pawl of my self-lookin g pin; v

Referring now to these drawingsflO indi'c'ates -a portion of a truss brake beam emb'odying a compression member 11, "a tension memberlQ and a strut 13 between the side members'l le'and 15 of which a brakeproject beyond the :members connected by the sha'nk andpro'vided with aself-loeking pawl 23. 1 a

In accordance with my present invention, thesaid extension-endportion-22 is provided with an axial bore 2 1 .01 less diameter than the "pin so as to leave acontinuous? peripheral wall 25 of suitable thickness about said axial bore; which' wallis pierced byan aperture or window-26 completelysurrounded by the peripheral walll 25, which is thus maintained Linweakened conditienat theinfsew of reduced width having vat its outer free .end an outwardly extending or pro ecting portion 28 of. a length and width sufiicient to completely close the said window 26 when moved into operative or locking position, an

- elbow 29 formed between the said shank and --pro ect1ng portion onthe outer edge bcmg adapted to rest on the bottom or sill portion 26 and to provide a means for limiting outward movement of the pawl.

The lower end of the shank portion of the pawl is preferably provided with a pivot bearing aperture 30 and also preferably has at said lower end a laterally extending'toe 81,

. adapted when the pawl is mounted to abut "The openend of the bore is preferably. closedby a cap 35 suitably fastenedin place. It will be seen that when the pawl is so coni ;fined it cannot escape irrespective of its against the inner wall of the bore 24- and to.

form a supplemental or secondary stop to limit the 'outward movement of the said pawl. v

The pawl 23 is normally pressed outwardly to cause its outer surface or'nose 28 to project through the said window 26. As

" illustrated, .bores 82, 32, are provided in the rear face of the said pawland coil springs 33 and 84 have their forward ends inserted in the said bores and their rear ends abutting against the wall of the bore 2 1. When so forced outwardly by the springs 33 and 34, the outward extension or nose of the pawl completely fills the window or aperture 26 so that the springs are completely enclosed and protected from the weather.

mountingand will perform its usualfunctrons. In the preferred embodiment ofiny invention,however, I mount the pawl pivotally and fasten the'cap. by a.single pin.

. Thus the cap is provided with a pair of 1I1' wardly extending filler strips 36 and 37, hav-: ing apertures 38 ande39 adapted to register,- when the cap is seated in place, withthe bearing aperture 30 of thepawl and the said pawl is thus pivotally mounted and the cap is fastened in place by providing holes 40 and 4:1: in opposite portions of the peripheral walls 25 which register .with the bearing apertures 30 and the filler strip apertures 38 and 39, then'passing a pin 42 through such registering holes 38 and 39, 4:0 and 41 and through thebearing aperture 30 of the pawl and thereafter flattening the ends of said pin to retain the same in place.

In the preferred embodiment of my inventhe tion shown the projecting portion 28 of the pawl 23 has the corner 28 at the rear edge so rounded as to cause the upper edge por tion to have substantially the shape of a segmental sphere or section of a ball which, during the retraction ofthe pin through a series of members which have .holes of varying diameters, such as in the parts 1a, 15 and 16 ofa brake beam, will more readilyslide along such uneven walls and will permit the pawl by aitwisting or turning movement of the pin to he slid or moved over the edge of a contracted holein one ofsuch members, thus overcoming a serious obj ection to the'use of this type of pin. 7 i

From the above it-will be seen that I have produced a pin or bolt which will have greatly. increased rigidity at the forward or insertion end; which will have increased weather resistmg propertles and durability which will have adouble mounting for the self-locking pawl so as to cause said pawl to be; retained in operative position independently of its pivot whereby even though the pivot pin fails to hold thepawl will still be operative ;Halso'that I provide the pawl with a firm limiting stop against outwardmovement furthermore that I utilize a pawl having a rounded projecting portion which will enable more ready retraction of the bolt through a series of holes of varying diameters in railway brake-beam levers and their connections or like devices; that I produce a pinconstructi'on in which an axial bore hav ing an isolated opening of less length'than' thebore will provide; a pawl housing and ing parts of pawl, excepting the operating nose thereof; also that I have utilized at the forward or insertion end a caphaving mounting members adapted to add further too maintain a continuous peripheral'wall which will greatly strengthen the construction and enable enclosure of allmounting and actuata the rigidity and solidity of the construetion and at the same time to completely close the mouth of the bore and to make the pawl parts and springs weather proof, to prevent deterioration thereof and to protect the same from the entrance of dust and-dirt.

Havingdescribed my invention, I claim: 1 A self locking pin for railway brake beam lever connections and the like, embodying a solids'hanklportion provided with a vhead and having at its opposite insertion end an extensioniportion provided with a dead-end axial bore to form a pawl housing,

said housing having an aperture pierced.

through the wall thereof spaced from/said insertion end of the pin, a pawl arranged within saidhousing and having a portion projecting through said aperture, a spring arranged within said housing for forcing saidprojecting portion through said aperture into operative position, said projecting portion being of a size and shapesubstantially filling said aperture when the pawl is in said. operative position, and a cap for closing the end of said bore. i

2. A self-locking pin embodying a shank portion having at its insertion end an axial bore to provide a pawl housing and an aperture pierced through the wall of said bore and spaced from said insertion end ofthe pin, a pawlarranged within said axial bore and having a portion projecting through said aperture a cap for closing the end of said bore and means for simultaneously mounting said pawl and fastening said cap] 3. A self-locking pin embodying ashank portion having at its insertion end an axial bore to provide a pawl housing and an aperture pierced through the wall of said housing and spaced from saidend of the pin; a pawl arranged in said housing and comprising a reduced shank portlon provided at its lower end with a bearing aperture and having a projecting portion provided with limiting means abutting against the wall of said housing aperture, a spring within said bore for forcing said projecting portion through said housing aperture, a cap having inwardly extending projections provided with apertures adapted to register'with the bearing aperture SETH A. CRONE. 

